The competition is known as the unofficial world championship of board paddling, and the Australian says he's in better shape than ever heading into this Sunday's race.
But mitchell isn't in it to prove anything, he's just excited to take on the challenge of the unknown.
"I think that's what draws you back, it changes every five minutes you know, you could be 10mph from the east or 25 mph from the northeast so you have to adjust as you're going and that's what's makes it's so exciting," said Mitchell.
"You know there's just nothing like being out there in the middle of the channel and it can be really really fun, but don't get me wrong there's time when it's not fun and you're hurting and you're tired and whatever, but it's fun," said defending women's paddleboard champion Kanesa Duncan.
Racing for a good cause can also help the pain too.